I've written a small htaccess file to redirect Internet Explorer users to a specific page Here are the contents :

# MS Internet Explorer - Mozilla v4
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^Mozilla/4(.*)MSIE
RewriteRule ^index\.php$ /sorry.php [L]

# All other browsers
#RewriteRule ^index\.html$ /index.32.html [L]

Any clue why this would give a 500 Internal Server Error ? I have used mod rewrite before so i have the module loaded there...